Please allow me to step in - just for your info:
Using v6.55 b3334, Windows 7 x64, 8GB RAM
-NO- SSD's just some old fashioned 6-7 years old HDD's
(thinking of a new pc though)
ChunkCacheSize=2000 <-tried this with 1000 but I am afraid it hardly makes any difference
400Mbits fiber up/down
See small video I just made.
Obviously the speed is fluctuating a bit, but generally I am getting the 400Mbits (even slightly higher most of the times)http://vid528.photobucket.com/albums/dd330/phwul/Newsbin%20Downloadspeed-Video-280215-145641_zpszrbzel0q.mp4
(it ends up with 343Mbits but that was because everything was downloaded)
Guess it must be something else then...?
Just my 2cts, leave it in the hands of Quade - just wanted to say that the chunks 2000 vs 1000, well, it doesn't make a lot of difference.
Maybe antivirus software? With me, a while ago, I was still using Kaspersky. It broke down my speed. I have been testing, trying,
communicating with experts for half a year. Speeds were dramatically below what it should be, sometimes just half the speed and very
strongly jumping up and down, jumping from 150Mbits to 300Mbits and down.
Friends checked out my speed with their laptops and got a stable speed above what I should get. At one point in time I removed Kaspersky
and replaced it with Norton and discovered that my speed was perfect...